Preparation method of antibacterial non-woven fabric and novel coated antibacterial non-woven fabric

Abstract

The invention discloses a preparation method of an antibacterial non-woven fabric and a novel coated antibacterial non-woven fabric, and the method comprises the following steps: adding a sodium chlorite solution and a hydrochloric acid solution into a reaction container, and carrying out a reaction under heating and stirring conditions to generate a mixed gas of chlorine dioxide and chlorine; the obtained gas passes through a ferrous chloride solution, and chlorine in the mixed gas is removed; introducing the obtained gas into pure water, adding a complexing agent and a stabilizer, and uniformly mixing and stirring to obtain the chlorine dioxide activation-free solution. On the premise of ensuring efficient removal of harmful gas, sterilization and peculiar smell removal, good durability is kept, large-scale production can be realized under a manufacturing process with certain requirements, the safety is high, the cost is relatively controllable, and a good market prospect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of textiles, and particularly to a preparation method of an antibacterial non-woven fabric and a novel coated antibacterial non-woven fabric. Background Art

[0002] With global warming and huge changes in climatic conditions around the world, in recent years, various highly contagious pathogens that have never been discovered have emerged, and serious public health security incidents have occurred globally many times. Therefore, in recent years, people's requirements for daily protection have also arisen, and the field of daily protection and sterilization appliances has achieved great development. At the same time, with the rapid development of social economy and the improvement of residents' living quality, people's requirements and investments in the field of great health are also gradually increasing. From daily household life to public health care, consumers' demands for removing harmful gases, sterilizing, and deodorizing are becoming increasingly significant.

[0003] Chlorine dioxide is a highly efficient, broad-spectrum, safe, and fast green disinfectant recommended by the World Health Organization (WHO) and the Food and Agriculture Organization of the United Nations (FAO). It is recognized as a Class A1 disinfectant because it has no triple carcinogenic reactions (carcinogenic, teratogenic, and mutagenic), and it is the only disinfectant to obtain this certification among all disinfectants. Chlorine dioxide has oxidizing properties and belongs to a highly efficient disinfectant, which can kill all pathogenic microorganisms without generating drug resistance. In particular, it has a highly efficient and rapid killing effect on various coronaviruses, baculoviruses, fungi, spores, etc. At present, most of the chlorine dioxide stable solutions used are products that need to be activated, and they have problems such as uncontrollable release rate, on-site preparation required before use, and the use of toxic stabilizers such as pyridine.

[0004] Non-woven fabric is a common industrial fabric, which is widely used in many industries such as chemical industry, household appliances, daily chemicals, medical treatment, and pets. Compared with other textile fabrics, non-woven fabric has a short process flow, fast production rate, high output, low cost, and wide uses. In recent years, in order to meet the diverse needs of consumers, composite functional non-woven fabrics have emerged in an endless stream.

[0005] Currently, there is no production process for non-woven fabric with chlorine dioxide slow-release function in the existing public work. Combining the active oxidation ability of chlorine dioxide with the widely used non-woven fabric will give rise to more application scenarios and demands. Summary of the Invention

[0006] The main purpose of the present invention is to propose a preparation method of an antibacterial non-woven fabric and a novel coated antibacterial non-woven fabric, aiming to improve the antibacterial ability of the non-woven fabric so as to adapt to more application scenarios and demands.

[0007] To achieve the above object, the present invention proposes a preparation method of an antibacterial non-woven fabric, and the method includes the following steps: Step S00: Soak or spray the chlorine dioxide non-activation solution evenly onto the non-woven fabric. Step S01: Dry the non-woven fabric obtained in Step S10 to prepare a finished product antibacterial cloth, where the drying temperature is 50 - 70°C.

[0008] A further technical solution of the present invention is that the preparation method of the chlorine dioxide non-activation solution includes the following steps: Step S10: Add the sodium chlorite solution and hydrochloric acid solution into a reaction vessel, and react under heating and stirring conditions to generate a mixed gas of chlorine dioxide and chlorine. Among them, the concentration of the sodium chlorite solution is 23 - 31%wt, the hydrochloric acid concentration is 20 - 35%wt, and the heating temperature is 60 - 90°C. Step S20: Pass the gas obtained in Step S10 through ferric dichloride solution to remove chlorine in the mixed gas. The concentration of the ferric dichloride solution is 30 - 50%wt. Step S30: Pass the gas obtained in Step S20 into pure water, and add a complexing agent and a stabilizer. After mixing and stirring, a chlorine dioxide non-activation solution is obtained. The complexing agent is one or more of sodium ethylenediaminetetraacetate, sodium citrate, and sodium hexametaphosphate; the stabilizer is one or more of polyvinyl alcohol PLA, carboxymethyl cellulose CMC, and polyacrylic acid PAA.

[0009] A further technical solution of the present invention is that in Step S30, when the stabilizer is polyvinyl alcohol PLA, the concentration of polyvinyl alcohol PLA is 3 - 5%wt, and the degree of polymerization is 30 - 50.

[0010] A further technical solution of the present invention is that in Step S30, when the stabilizer is carboxymethyl cellulose CMC, the concentration of carboxymethyl cellulose CMC is 2 - 5%wt, and the degree of polymerization is 30 - 90.

[0011] A further technical solution of the present invention is that in Step S30, when the stabilizer is polyacrylic acid PAA, the concentration of polyacrylic acid PAA is 2.5 - 6.5%wt, and the degree of polymerization is 30 - 50.

[0012] A further technical solution of the present invention is that in Step S30, when the complexing agent is sodium ethylenediaminetetraacetate, the concentration of sodium ethylenediaminetetraacetate is 0.2 - 3.0%wt.

[0013] A further technical solution of the present invention is that in Step S30, when the complexing agent is sodium citrate, the concentration of sodium citrate is 0.5 - 3.0%wt.

[0014] A further technical solution of the present invention is that in step S30, when the complexing agent is sodium hexametaphosphate, the concentration of sodium hexametaphosphate is 0.2 - 2.0% wt.

[0015] A further technical solution of the present invention is that iron blocks and hydrochloric acid are added to the ferric chloride solution as regenerants.

[0016] To achieve the above object, the present invention also provides a novel coated antibacterial non-woven fabric, which is prepared by using the preparation method of the antibacterial non-woven fabric as described above.

[0017] The preparation method of the antibacterial non-woven fabric and the novel coated antibacterial non-woven fabric of the present invention organically combine the broad-spectrum bactericidal and harmful gas oxidation and decomposition properties of chlorine dioxide gas with the non-woven fabric. On the premise of ensuring efficient removal of harmful gases, sterilization and odor removal, good durability is maintained, large-scale production can be achieved under certain manufacturing processes, with high safety and relatively controllable costs, and has good market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0019] Figure 1 is a schematic flow chart of the preparation method of the chlorine dioxide non-activation solution of the present invention; Figure 2 is a comparison schematic diagram between the novel coated antibacterial non-woven fabric of the present invention and the comparative example.

[0020] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0022] The present invention provides a method for preparing an antibacterial non-woven fabric and a novel coated antibacterial non-woven fabric. The novel coated antibacterial non-woven fabric uses a special chlorine dioxide non-activation solution, which is uniformly infiltrated onto the non-woven fabric by soaking or spraying. Utilizing the inherent fiber material of the non-woven fabric to lock its active ingredients, and then drying it at a certain temperature (pay attention to controlling a reasonable temperature to avoid losing the active ingredients), the finished novel coated antibacterial non-woven fabric is prepared. The novel coated antibacterial non-woven fabric maintains good durability while ensuring efficient removal of harmful gases, sterilization, and odor removal. It can be mass-produced under certain manufacturing processes, has high safety, relatively controllable costs, and has good market prospects.

[0023] Specifically, the present invention provides a method for preparing an antibacterial non-woven fabric, and the method includes the following steps: Step S00: Soak or spray the chlorine dioxide non-activation solution uniformly onto the non-woven fabric. Step S01: Dry the non-woven fabric obtained in step S10 to prepare a finished sterilizing cloth, wherein the drying temperature is 50 - 70 °C.

[0024] Please refer to Figure 1 , the method for preparing the chlorine dioxide non-activation solution in the present invention includes the following steps: Step S10: Add the sodium chlorite solution and hydrochloric acid solution into a reaction vessel, and react under heating and stirring conditions to generate a mixed gas of chlorine dioxide and chlorine. Among them, the concentration of the sodium chlorite solution is 23 - 31%wt, the concentration of hydrochloric acid is 20 - 35%wt, and the heating temperature is 60 - 90 °C.

[0025] Step S20: Pass the gas obtained in step S10 through the ferric chloride solution to remove chlorine in the mixed gas. The concentration of the ferric chloride solution is 30 - 50%wt. When necessary, iron blocks and hydrochloric acid can be added to the ferric chloride solution as a regenerant.

[0026] Step S30: Pass the gas obtained in step S20 into pure water, and add a complexing agent and a stabilizer. After mixing and stirring, a chlorine dioxide non-activation solution is obtained. The complexing agent is one or more of sodium ethylenediaminetetraacetate, sodium citrate, and sodium hexametaphosphate; the stabilizer is one or more of polyvinyl alcohol PLA, carboxymethyl cellulose CMC, and polyacrylic acid PAA.

[0027] Among them, in step S30, when the stabilizer is polyvinyl alcohol PLA, the concentration of polyvinyl alcohol PLA is 3 - 5%wt, and the degree of polymerization is 30 - 50.

[0028] When the stabilizer is carboxymethyl cellulose CMC, the concentration of carboxymethyl cellulose CMC is 2 - 5%wt, and the degree of polymerization is 30 - 90.

[0029] When the stabilizer is polyacrylic acid (PAA), the concentration of polyacrylic acid (PAA) is 2.5 - 6.5%wt, and the degree of polymerization is 30 - 50.

[0030] When the complexing agent is sodium ethylenediaminetetraacetate, the concentration of sodium ethylenediaminetetraacetate is 0.2 - 3.0%wt.

[0031] When the complexing agent is sodium citrate, the concentration of sodium citrate is 0.5 - 3.0%wt.

[0032] When the complexing agent is sodium hexametaphosphate, the concentration of sodium hexametaphosphate is 0.2 - 2.0%wt.

[0033] The preparation method of the chlorine dioxide non-activation solution of the present invention will be described below in conjunction with embodiments. Example 1

[0034] First, add the sodium chlorite solution and the hydrochloric acid solution into the reaction vessel, and react under the conditions of heating and stirring to generate a mixed gas of chlorine dioxide and chlorine; in the obtained solution, the concentration of the sodium chlorite solution is 23%wt, the concentration of hydrochloric acid is 20%wt, and the reaction is carried out at 60°C for 30 minutes.

[0035] Then, slowly pass the generated mixed gas of chlorine dioxide and chlorine into the 50%wt ferrous dichloride solution to remove the chlorine in the mixed gas. If necessary, iron blocks and hydrochloric acid can be added to the ferric chloride solution as a regenerant.

[0036] Finally, pass the obtained gas into pure water, and add polyvinyl alcohol (PLA) and sodium hexametaphosphate, and mix and stir to obtain the chlorine dioxide non-activation solution. In the obtained solution, the concentration of polyvinyl alcohol (PLA) is 3%wt, the degree of polymerization is 30 - 50, and the concentration of sodium hexametaphosphate is 0.5%wt. Example 2

[0037] First, add the sodium chlorite solution and the hydrochloric acid solution into the reaction vessel, and react under the conditions of heating and stirring to generate a mixed gas of chlorine dioxide and chlorine; in the obtained solution, the concentration of the sodium chlorite solution is 31%wt, the concentration of hydrochloric acid is 20%wt, and the reaction is carried out at 60°C for 30 minutes.

[0038] Then, slowly pass the generated mixed gas of chlorine dioxide and chlorine into the 50%wt ferrous dichloride solution to remove the chlorine in the mixed gas. If necessary, iron blocks and hydrochloric acid can be added to the ferric chloride solution as a regenerant.

[0039] Finally, the obtained gas is introduced into pure water, and polyvinyl alcohol PLA and sodium hexametaphosphate are added. After mixing and stirring, a chlorine dioxide non-activation solution is obtained. In the obtained solution, the concentration of polyvinyl alcohol PLA is 3%wt, the degree of polymerization is 30 - 50, and the concentration of sodium hexametaphosphate is 0.5%wt. Example 3

[0040] First, sodium chlorite solution and hydrochloric acid solution are added to a reaction vessel, and the reaction is carried out under heating and stirring conditions to generate a mixed gas of chlorine dioxide and chlorine; in the obtained solution, the concentration of sodium chlorite solution is 31%wt, the concentration of hydrochloric acid is 30%wt, and the reaction is carried out at 60°C for 30 minutes.

[0041] Then, the generated mixed gas of chlorine dioxide and chlorine is slowly introduced into a 50%wt ferrous dichloride solution to remove chlorine in the mixed gas. If necessary, iron blocks and hydrochloric acid can be added to the ferrous dichloride solution as a regenerant.

[0042] Finally, the obtained gas is introduced into pure water, and polyvinyl alcohol PLA and sodium hexametaphosphate are added. After mixing and stirring, a chlorine dioxide non-activation solution is obtained. In the obtained solution, the concentration of polyvinyl alcohol PLA is 3%wt, the degree of polymerization is 30 - 50, and the concentration of sodium hexametaphosphate is 1%wt.

[0043] To achieve the above object, the present invention also provides a method for preparing an antibacterial non-woven fabric. The method uses the chlorine dioxide non-activation solution as described in the above examples, and the method includes the following steps: Step S10, uniformly infiltrating the chlorine dioxide non-activation solution on the non-woven fabric by means of soaking or spraying.

[0044] Step S20, drying the non-woven fabric obtained in step S10 to prepare a finished antibacterial fabric, wherein the drying temperature is 50 - 70°C.

[0045] The following elaborates in detail the method for preparing the antibacterial non-woven fabric of the present invention in combination with examples. Example 4

[0046] First, the chlorine dioxide non-activation solution obtained in Example 1 is uniformly infiltrated on the non-woven fabric by means of soaking. The ratio of the weight of the soaking solution to the non-woven fabric is 1:20. Then, the infiltrated non-woven fabric is dried at 60°C for 30 minutes to obtain an antibacterial non-woven fabric. Example 5

[0047] First, the chlorine dioxide non-activation solution obtained in Example 2 is uniformly infiltrated on the non-woven fabric by means of soaking. The ratio of the weight of the soaking solution to the non-woven fabric is 1:20. Then, the infiltrated non-woven fabric is dried at 60°C for 30 minutes to obtain an antibacterial non-woven fabric. Example 6

[0048] First, the chlorine dioxide non-activation solution obtained in Example 3 is evenly infiltrated onto the non-woven fabric by the immersion method. The ratio of the weight of the immersion solution to the non-woven fabric is 1:20. Then, the infiltrated non-woven fabric is dried at 60 °C for 30 minutes to obtain the antibacterial non-woven fabric.

[0049] Comparative Example The comparative example is a non-woven fabric without any solution immersion treatment.

[0050] Antibacterial performance test: As Figure 2 shown, according to the detection method of "GB / T 20944.2-2007 Evaluation of antibacterial properties of textiles - Part 2: Absorption method", this antibacterial performance detection is carried out on the antibacterial fabrics in each example and the comparative example. The specific detection method is as follows: After inoculating the experimental bacterial solution on each example and the comparative example for 18 hours, it is eluted, diluted, coated, and the coated plate is taken. After culturing for 24 hours, direct viable count is carried out to obtain the result. The higher the antibacterial rate, the better the antibacterial performance of the antibacterial fabric.

[0051] According to the provisions of the detection standard, when the bacterial growth value of the control sample ≥ 1.5, the test result is valid.

[0052] From the detection results, the antibacterial performance of Example 6 is the best. It can be seen that the non-woven fabric treated with the solution with increased concentrations of sodium chlorite, hydrochloric acid solution, and complexing agent sodium hexametaphosphate in Example 3 not only increases the chlorine dioxide concentration but also further enhances its stability, thus improving the antibacterial performance of the antibacterial non-woven fabric.

[0053] Compared with Example 6, the antibacterial performance of Example 5 is slightly reduced, but it is better than that of Example 4. It can be seen that increasing the concentration of the sodium chlorite solution can increase the chlorine dioxide concentration of the obtained solution, so the antibacterial performance is better than that of Example 4. However, the stability of the solution obtained in Example 5 is lower than that of Example 6, so the antibacterial performance is affected.

[0054] To achieve the above object, the present invention also proposes a new type of coated antibacterial non-woven fabric, which is prepared by using the preparation method of the antibacterial non-woven fabric as described above.

[0055] The new type of coated antibacterial non-woven fabric of the present invention organically combines the properties of chlorine dioxide gas with broad-spectrum bactericidal and harmful gas oxidation and decomposition with the non-woven fabric. On the premise of ensuring efficient removal of harmful gases, sterilization, and odor removal, it maintains good durability, can be mass-produced under certain required manufacturing processes, has high safety, relatively controllable costs, and has good market prospects.

[0056] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A method for preparing an antibacterial nonwoven fabric, characterized in that: The method comprises the following steps: Step S00, the chlorine dioxide activation-free solution is evenly soaked on the non-woven fabric by soaking or spraying; Step S01, drying the nonwoven fabric obtained in step S10 to prepare a finished sterilization cloth, wherein the drying temperature is 50-70°C.

2. The method for preparing the antibacterial nonwoven fabric according to claim 1, characterized in that: The preparation method of the chlorine dioxide activation-free solution comprises the following steps: Step S10, adding a sodium chlorite solution and a hydrochloric acid solution into a reaction container, reacting under heating and stirring conditions to generate a mixed gas of chlorine dioxide and chlorine, wherein the concentration of the sodium chlorite solution is 23-31%wt, the concentration of the hydrochloric acid is 20-35%wt, and the heating temperature is 60-90°C; Step S20, passing the gas obtained in step S10 through a ferric chloride solution to remove chlorine in the mixed gas, wherein the concentration of the ferric chloride solution is 30-50%wt; Step S30, passing the gas obtained in step S20 into pure water, and adding a complexing agent and a stabilizer, mixing and stirring to obtain a chlorine dioxide activation-free solution, wherein the complexing agent is one or more of sodium ethylenediaminetetraacetate, sodium citrate and sodium hexametaphosphate; and the stabilizer is one or more of polyvinyl alcohol PLA, carboxymethyl cellulose CMC, and polyacrylic acid PAA.

3. The method for preparing the antibacterial nonwoven fabric according to claim 2, characterized in that: In step S30, when the stabilizer is polyvinyl alcohol PLA, the concentration of polyvinyl alcohol PLA is 3-5%wt and the degree of polymerization is 30-50.

4. The method for preparing the antibacterial nonwoven fabric according to claim 2, characterized in that: In step S30, when the stabilizer is carboxymethyl cellulose CMC, the concentration of carboxymethyl cellulose CMC is 2-5%wt, and the degree of polymerization is 30-90.

5. The method for preparing the antibacterial nonwoven fabric according to claim 2, characterized in that: In step S30, when the stabilizer is polyacrylic acid PAA, the concentration of polyacrylic acid PAA is 2.5-6.5%wt, and the degree of polymerization is 30-50.

6. The method for preparing the antibacterial nonwoven fabric according to claim 2, characterized in that: In step S30, when the complexing agent is sodium ethylenediaminetetraacetate, the concentration of sodium ethylenediaminetetraacetate is 0.2-3.0%wt.

7. The method for preparing the antibacterial nonwoven fabric according to claim 2, characterized in that: In step S30, when the complexing agent is sodium citrate, the concentration of sodium citrate is 0.5-3.0%wt.

8. The method for preparing the antibacterial nonwoven fabric according to claim 2, characterized in that: In step S30, when the complexing agent is sodium hexametaphosphate, the concentration of sodium hexametaphosphate is 0.2-2.0%wt.

9. The method for preparing the antibacterial nonwoven fabric according to any one of claims 1 to 8, characterized in that: Iron blocks and hydrochloric acid are added into the ferric chloride solution as regeneration agents.

10. A novel antibacterial coated nonwoven fabric, characterized in that: The novel coated antibacterial nonwoven fabric is prepared by the method for preparing the antibacterial nonwoven fabric according to any one of claims 1 to 9.

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